Students would be the subject because they are the ones doing the action. Questions is the direct object, and Elsa is the indirect object
Carbon is added to the environment just by humans and higher animals breathing in oxygen and breathing out carbon dioxide. But by far the biggest contributor of carbon to the environment especially the atmosphere is the burning of fossil fuels which then contribute to the greenhouse gases which in turn cause global warming. Water vapour, carbon dioxide, methane and ozone are the main constituents of greenhouse gas.
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the process of making food in the presence of water, carbon dioxide and sunlight oxygen is called photosynthesis
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